Please try to include photos to show all parts of the fungus, eg top, stem, and gills.
Note any smells, and associated trees or plants (eg oak, birch). A spore print can be very useful.

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Hello. My first post on this forum. Glad to have found you!
I have just picked these Russulas. Growing around a mature oak tree. The soil is acid and sometimes poorly drained - although this particular spot is drier than most of the surrounding area. Over years I normally collect the Miller and Penny Buns from the same place, but have strangely not noticed this Russula before. Any help identifying it would be appreciated.

Chris has perectly right, when he states that Russula is usually not to identify macroscopically by foto.
But with some expercience some species can nevertheless be named with a high certainty (though not an absolute certainty ...)

In your case I would bet a lot on Russula vesca, as the general habit the colour and especially the short and conical stipe are to be seen. Also the nearly whute gills and the ecology fit well.
So, no 100% determination, but more than only a guess ....